In Japan, some teens become hikikomori, often after being victims of severe bullying.Someone who is hikikomori can be described as

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The definition of a hikikomori is someone who has withdrawn from all social interaction, typically spending months or even years in isolation. While bullying may be a factor in the development of this condition, hikikomori is not characterized by aggression or paranoia.

In Japan, Some Teens Become Hikikomori, Often After Being Victims